Sewing machine



Oct. 11, 1938. c. F. RUBEL SEWING MACHINE Filed May 21, 1936 5 Sheets-Sheet 1 INVENTORQ fiharlas fiRubeD,

WITNESSES:

TORNEYS.

HQZ

c. F. RUBEL SEWING MACHINE Oct, 11,1938. 2,133,229

5 Sheets-Sheet 2 Filed May 21, 1936 INVENTORQ C. F. RUBEL Oct. 11, 1938.

SEWING MACHINE Filed May 21, 1936 v 5 Sheets-Sheet 3 WIT/W525i? I I INVENTOR:

Charlies if liubd, BY 5% q T ORA lEYS.

Oct. 11, 1938.

c. F. RUBEL 2,133,229

SEWING MACHINE v Filed May 21, 1936 5 Sheets-Sheet 4 Hazy: b ,2;

62 1 5 m 5 J 57 J52 I 5 1'! A f? .52 W n I I 55 l I K l I 5 4 l v;:. I

WITNESSES: I N V EN TOR:

BY Charles F RuZmL,

TORNEYS.

C. F. RUBEL SEWING MACHINE Oct. 11, 1938.

Filed May 21, 1956 5 Shee tsSheet 5 m VENTOR. F Charla; F Rahal,

TORNEYS Patented on. 11, 1938- UNITED STATES SEWING MACHINE Charles F. Rubel, Chicago, Ill., assignor to Union Special Machine Company, Chicago, 111., a corporation of Illinois Application May 21, 1936, Serial No. 80,943

This invention relates to sewing machines; and it has reference more particularly to what are known as cup feed sewing machines wherein the fabric'edges which are to be united, a'refed between a pair of tangentially-arranged -intermittently-rotated wheels or cups and thereby advanced progressively relative to the seaming instrumentalities of the machine.

' A sewing machine of the type specifically referred to is featured in U. S. Patent 2,043,711

granted to the present applicant and: Anton Wyleta on June 9, 1936, the same having three thread manipulating instrumentalities, to wit, a longitudinally reciprocating needle, a-looper with both l5 oscillatory and needle followin ovements, and

a spreader confined to oscillatory movement alone in cooperating with said needle and looper. The machine produces a two-thread over-edgeseam which is not altogether satisfactory forcertain classes of work for example,'in seaming full fashioned hosiery and the like, due to its tendency to gap.

My invention is directed toward making possible theconversion of a cup feed sewing machine of the specifically indicated sort, for the production of three-thread overedge seams which are proof against gapping, without necessitating the aid of thread manipulating instrumentalities other than those already on-the machine, and

without requiring any changes whatever in the motion of said 'instrumentalitiesor in the construction and arrangement of the mechanism relied upon to actuate them.

The foregoing and other attendant advantages 3, I attain as hereinafter more fully described, through a slight change in the instrumentality which heretofore functioned solely as a. spreader whereby the same is adapted to perform in the added capacity of a looper. for carrying and i I) manipulating a third yarn; and by providing suitable facilities for guiding and tensioning this third yarn enroute to said instrumentality.

In the drawings, Fig. I shows, in elevation, one side of a cup, 45 feed sewing machine conveniently embodying my invention.

Fig. II is a fragmentary view drawn toa larger scale and showing-the machine'in longitudinal section. 50 Fig. III is a fragmentary plan section along a staggered plane indicated approximately by the arrows III-III in Figs. Land H.

Figs. IV, V, VI and VII are fragmentary per-' .spective views showing the positions assumed by 55 the thread manipulating elements of my improved 16 Claims. (CL- 112-'-16) cup feed sewing machine, incident to performance of one of the loop forming cycles.

The cup feed sewing machine herein illustrated is,-general1y speaking, like the one featured in the patent, supra, and, as shown, comprises a 5 hollow housing in the form of a standard I witha lateral projection or head 2 at the top thereof. Suspended from the head 2 is a pair of tangentially-arranged, circumferentially-knurled feed wheels or cups 3 and 4, which are secured to the 101 'cup [to facilitate insertion of the fabric edges F and-F (Figs. III-VII) between them. Suitable 20 spring means (not illustrated) influential upon the bearing. bracket 9, serves to maintain the feed cup 3 inyielding engagement with the companion 'feedcup 4. The shaft 6 for the feed cup l is journaledin a fixedbearing II on the machine 25 housing, and secured to its upper end within the head 2, is a spur gear wheel l2 which meshes with a similar spur gear wheel l3 at the top of the, upper section 5a of the shaft 5-for the cup 3 so that the two cups are driven in unison. Inter- '30 mittent rotation is imparted to the cups 3 and 4 through the medium of a rotary clutch device 15 on the shaft 6 actuated by a link rod l6 having an adjustable pivotal connection at ll with an upright arm l8 on a rock shaft [9 journaled within the machine housing I. Rocking movement is imparted to the shaft [9 by virtue of the coordination of a horizontal arm 20 thereon with the rod 2| of an eccentric strap 22 whichembraces an eccentric (not shown) on a'transverse drive shaft 23 whereof the opposite ends are iournaled in oil tight bearings afforded by the' side walls of the housing. The drive shaft 23 extends to the exterior of the housing I at the side of the machine shown in Fig. I, and has there secured to it a combined hand wheel and pulley 24 whereby the machine may be actuated either manually or under power. The needle 25 of the machine operates directly above the edges of the feed cups 3 and 4 at the region of tangency of the latter,and is fixed inthe outer end of a reciprocating horizontal supporting member in the form of abar 26 which is guided for axial or endwise, movement in an oil tight connection or bushing 21 set'into the front wall 28 of the housing 5 usual thread carrying looper of the machine is designated 3| and, as shown, is adjustably secured by a set screw 32, in a transverse aperture at the outer end of a supporting member or bar 33 which extends at a slight upward inclination to the horizontal into the interior of the housing i.

From Fig. II it will be noted that the bar 33 is journaled, with capacity for combined axial and oscillatory movement, in oil tight bearing bush ings 34 and 35 set respectively into the front and rear walls 28 and 35 of the housing I. Oscillatory movement is imparted to the looper bar 33 from the drive shaft 23 through'an eccentric strap rod 31 whereof the upper .end engages a pin 38 extending laterally from a block 39 which is secured to said bar within the housing. in the interval between the bushings 34 and 3.5. The bar 33 receives its endwise movements from another crank 40 on the drive shaft 23, said crank being connected by means of a pitman M, with the lower end of a rocker arm 42 fulcrumed to.

swing on the fixed center 43 and having its upper end in turn coupled, by means of a link 44, with the block 39 on the said bar. The other thread manipulating instrumentality 45 of the machine is confined solely to oscillatory motion about the axis of another upwardly-inclined supporting member or bar 46 which extends substantially parallel to the looper rod 33 and to the outer end of which said instrumentality is secured. As shown in Fig. II, the bar 46 for the instrumentality 45 is journaled in an elongated oil tight bushing 41 secured in the front wall 28 of the housing I. Within the housing I a laterally extending pin 48 on the bar 46 connects with the upper end of an eccentric strap rod 49 which is actuated by another eccentric (not shown) on the drive shaft 23.

The usual stitch tongue indicated at 50, over which the seam loops are formed, is supported directly above the needle 25 and in the plane of tangency of the two feed cups 3. and 4 by an arm 5i at the bottom end of an adjustably-fixed bracket 52 pendant from the head 2 of the housing l. The needle thread 53 is drawn from a suitable source of supply (not shown) through a tension device 54 at the side of the. machine remote from the observer in Fig. I, then passes under a fixed guide finger 55, then to a guide eye 56 on the needle bar 26 and finally to the eye 5|, then to a guide eye 62 at the outer end of of the needle 25. The looper thread 51, on the other hand, first passes through a tension device 58 at the near side of the machine in Fig. I, then through a fixed guide eye 59, then to a spring take-up 50, then through another fixed guide eye the looper bar 33, andflnally to-the looper 3|. In order to convert a cup feed sewing machine such as described for the purposes of my invention, I slightly alter the. form of the instrumenta'lity 45 from that shown in the patent hereinbeiore referred to, that is to say. I provide said instrumentality with eyes 53 and 64, respectively, at the toe and-heel ends of its tongueportion' l5, and with a connecting groove 06 between said eyes forv passage of a third yarn 61. as well as with a hook 68 at said heel for controlling the looper thread 51. As a result of this change, the instrumentality 45 is made capable of performing in the added capacity of a supplemental threadcarrying looper in a manner presently explained. Forpurposes of distinction, the instrumentality 45 will be hereinafter referred to as the "supplemental looper. On its way to the supplemental looper 45 from a supply source (not shown) the additional thread 61 first.passes through a tension device 69 positioned adjacent the tension device 58 for the looper thread 51 at the side of the machine pictured in Fig. I, then through a fixed guide eye 10, and then over a guide finger 1| (Figs. I .and II) secured to the underside of the head 2 of the machine housing, and finally through the guide eye 62 through which the thread 51 also passes as hereinbefore explained. The loop forming cycle of the machine is as follows: I a

In Fig. IV the supplemental looper 45 has just released a loop 12 of the looper thread 51 and is nearing the limit of its upward swing; while the looper 3i is swinging forward crosswise of the needle through the needle thread loop 13 and at the same time following the needle 25 which has already started on its retractive stroke. In Fig. V, the looper 3| has reached the limit of its for- 'ward swing, holding the needle thread loop 13 and still following the needle 25 but at a decelerating rate; whileat the same time, the supplemental looper 45 is moving down immediately behind .said looper 3i and engaging the looper thread 51. In Fig. VI, the supplemental looper -45 has reached the limit of its downward swing crosswise of the needle 25, with the new loop 14 of the thread 51 arrested in its hook 68, and has positioned the thread 61 so that said needle can pass over it on its next advancing stroke. In Fig. VII, the looper 3| has just released the needle thread loop 13 and is nearing the limit of its retractive swing, while the needle 25 is advancing over the thread 51 to hold the latter during the succeeding upward swing of the supplemental,

looper 45. The parts thereupon all return to the position shown in Fig. IV for the initiation of the next loop forming cycle, which, of course, occurs immediately after advance of the two fabric edges F, F. by the feed cups 3 and 4. During the functioning of the needle 25 and the thread manipulating instru-mentalities 3| and 45 as just explained, the seam loops are formed over the stitch finger 50 .in a manner well known in the art.

Having thus described my invention, I claim:

l. In a sewing machine, a pair of feed cups for advancing between them a number of fabric edges which are to be'united;v a reciprocating needle; a cooperating thread carrying looper for engagingthe thread of the needle and drawing loops therefrom, said looper having oscillatory movement crosswise of the needle .as well as bodily movement in the direction of the needle; and a supplemental thread-carrying looper confined to oscillatory movement crosswise of the ing a tongue end to draw loops, from the thread of the first mentioned looper, and a projection on said tongue to control the first looper thread- 3. In a sewing machine, a pair of feed cups for advancing between them'a number of fabric edges which are to be united; a reciprocating needle; a cooperating thread-carrying looper for engaging the thread of the needle and drawing loops therefrom, said looper having'oscillatory movement crosswise of the needle as well as bodily movement in the direction of the needle; and a supplemental thread-carrying looper confined to oscillatory movement crosswise of 'the needle, said supplemental looper having a tongue end to draw loops from the thread of the first mentioned looper, and a projection on said tongue to control the first looper thread loops.

4. In a sewing machine, a pair of feed cups for advancing between them a number of fabric edges which are to be united; a reciprocating needle; a cooperating thread-carrying looper for drawing-loops from the thread of the needle; a

' bar supporting the looper; means for oscillating the bar to move the looper crosswise of the needle and for reciprocating it endwise to concurrently move the looper in the direction of the needle; a supplemental thread-carrying looper to draw loops from the thread of the first mentioned looper; a supporting bar for the supplemental looper; and means for oscillating the last men tioned bar to move the supplemental looper crosswise of the needle in timed relation with the latter and the first looper.

5. In a sewing machine, a pair of feed cups for advancing between thema number of'fabric edges which are to be united; a reciprocating needle; a cooperating thread-carrying looper for drawing loops of the thread on the needle; a bar supporting the looper; means for oscillating the bar to move the looper crosswise of the needle and for reciprocating it endwise to move the looper in the direction of the needle; a supplemental thread-carrying looper to engage. the thread of the first mentioned looper and to draw loops therefrom, said supplemental looper having a projection to control the first looper thread loops; a supporting bar for the supplemental looper; and means for oscillating the last mentioned bar to move the supplemental looper crosswise of the needle in timed relation with the latter and said first looper.

6. In a sewing machine, a housing; a pair'of horizontally-arranged feed cups supported at an elevation by the housing for advancing between them a number of fabric edges which are to be united; a needle movable crosswise of the upper edges of the two feed cups in the region of their tangency; a horizontal needle bar extending through a guide bearing into the interior of the housing; a thread-carrying looper for drawing needle thread loops from the needle; a bar-supporting the looper and extending through a bearing into the interior of the housing; asupplemental thread-carrying looper to take the thread of the first mentioned looper and draw loops therefrom; a bar carrying the supplemental looper and likewise extending into the housing; and mechanism within the housing operative to eifect, in timed relation, intermittent rotation of the feed cups, endwise reciprocation of the needle bar, combined oscillatory and endwise movement of, the looper bar, and oscillatory movement alone of thesupplemental bar.

7. In a sewing machine, 'a housing; a pair of horizontally-arranged reed cups supported at an elevation. by said housing fonadvancing between them a number of fabric edges which are to be ,united;'a needle movable crosswise of the top edges. of the two feed cups in the region of their tangency; a horizontal needle bar extending through a guide bearing into the interior of the housing; a thread-carrying looperfor drawing needle thread loops from the needle; a bar supporting the looper and extending at an upward inclination to the horizontal through abearinginto the interior of the housing; a. supplemental thread-carrying looper to take' the thread of the first mentioned looper and draw loops therefrom; a bar carrying the supplemental looper and likewise extending at an upward inclination ,to the' horizontal into thehousing; and mechanism within said housing operative to effect, in timed relation, intermittent rotation of the said feed cups, endwise reciprocation of the needle bar, combined oscillatory and endwise movement of the firstlooper bar, and oscillatory movement alone of the'supplemental looper bar.

8. In a sewing machine, a housing. with a-laterally projecting head; a horizontally-reciprocating needle bar and a needle carried thereby beneath said head; vertical shafts mounted in and depending from said head, the plane of saidshafts being'at an acute angle to thepath of needle movement; wheels at the lower ends of said shafts for feeding a number: of fabric edges; and individual thread-carrying instrumentalities' cooperating with said needle in forming a three thread overedge seam to unite the fabric edges.

'9. In a sewing machine, a housing having a laterally-projecting head; a horizontally-reciprocating needle bar and a needle carried by said bar beneath the head; vertical shafts mounted in and depending from said head, the axes of said shafts being in azplane at an acute angle to .the path of needle; movement; feed wheels at the lower ends of said shafts for feeding a number of fabric edges; a thread carrying looper; means;'supporting said looper for oscillation into and 'out ofthe needle thread loops and for movement laterally to a position over the fabric ;edges,; 'and a supplemental thread carry-.

ing looper; cooperating with the first mentioned looper-and the needle in the formation of a' three thread overedge seam.

10. In a sewing machine, a'housing with a latterally-projecting head; a pair of feed cups suspended from the head for advancing between them a number of fabric edges which are to be united; a needle movable crosswise of the top edges of the two feed cups in the region oi their tangency; a horizontal needle-supporting bar extending through a guide bearing into the interior ment of the first looper bar, and oscillatory movement alone of the supplemental looper'bar.

1'1.'In a sewing machine, a housing with a laterally-projecting head at its topya pair of feed cups suspended from the head for advancfate-5150 be united; a needle movable crosswise of r-thefltop edges of the two feed cups in the region of their tangency; a-horizontal needle bar extending through a guide bearing into the interior of the housing; a thread-carrying looper for drawing needle thread loops from the needle; a bar supporting the looper and extending at an upward inclination to the horizontal through a bearing into the interior of the housing; a supplemental thread-carrying looper to take the thread of the first mentioned looper and draw loops therefrom; a bar carrying the supplemental looper and likewise extending at an upward inclination to the horizontal into the housing; and mechanism within the housing operative to effect in timed relation, intermittent rotation of the feed cups, endwise reciprocation of the needle bar, combined oscillatory and endwise movement of the first looper bar, and oscillatory movement alone of the supplemental looper bar. 4

12. A sewing machine for forming a three thread overedge seam, comprising a drive shaft; feed wheels for supporting and advancing a number of fabric edges in a vertical plane; a needle;

a bar carrying said needle and extending from a point adjacent the feed Wheels to a point adjacent said drive shaft; means operated by said drive shaft for reciprocating said needle bar; a looper; a looper bar mounted for oscillation and endwise movement on a fixed axis and extending from a position adjacent the feed wheel to a position adjacent said shaft;rmeans operated by the shaft for oscillating the looper bar and for moving it endwise; a supplemental threadcarrying looper cooperating with thefirst mentioned looper and the needle; a bar supporting said supplemental thread-carrying looper mounted for oscillation-about a fixed axis extending from a point adjacent the feed wheels to a point adjacent said shaft; and means operated by said shaft for oscillating the last mentioned bar.

13. In a sewing machine, opposed feed wheels for supporting and advancing a number of fabric edgesin a vertical plane; a needle and means for imparting endwise movement thereto; a looper andmeans for oscillating it about a fixed axis and for reciprocating it in the line of said axis whereby said looper is moved in the direction of feed as well as transversely thereof from a position above one of the feed wheels to a position above the other feed wheel; and a supplemental thread-carrying looper cooperating with ingpbtween them a number of fabric edges which the first mentioned looper and said needle in forming a three thread overedge seam about the fabric edges.

14. In a sewing machine a closed housing; means exteriorly of. the housing for feeding a number of fabric edges; a thread-carrying needle and a plurality of cooperative individual threadcarrying instrumentalities also exteriorly of the housing for forming an over-edge uniting seam wherein individual loops of the threads of the cooperative instrumentalities are concatenated with each other and with the needle thread loops; supporting members for said needle and said instrumentalities respectively con-fined to movement in fixed axial lines and extending through oil tight connections into the interior of the housing; and mechanism within the housing for actuating said supporting members.

15. In a sewing machine, a closed housing;

means exteriorly of the housing for feeding a number of fabric edges; a thread-carrying needle and a pair of cooperative individual threadcarrying instrumentalities also exteriorly of the housing for forming a three-thread over-edge uniting seam wherein individual loops of the threads of the two cooperative instrumentalities l wheels exteriorly of the housing for supporting and advancing a number of fabric edges; 2. thread-carrying needle and a pair of cooperating individual thread-carrying instrumentalities also exteriorly of the housing and above the feed Wheels forforming a three-thread over-edge uniting seam wherein individual loops of the threads of the two cooperative instrumentalities are concatenated with each -other and with the needle thread loops; actuating mechanism within the housing; and individual bars or shafts respectively confined to movement in fixed axial lines and having oil tight connections with a wall of the housing whereby the necessary movements are communicated from the actuating mechanism to the feed wheels, the needle and the cooperative instrumentalities aforesaid.

CHARLES F. RUBEL. 

